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worktree: add: auto-vivify new branch when <branch> is omitted

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As a convenience, when <branch> is omitted from "git worktree <path>
<branch>" and neither -b nor -B is used, automatically create a new
branch named after <path>, as if "-b $(basename <path>)" was specified.
Thus, "git worktree add ../hotfix" creates a new branch named "hotfix"
and associates it with new worktree "../hotfix".

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Sunshine 2015-07-06 13:30:59 -04:00 committed by Junio C Hamano
parent 0f4af3b9ea
commit 1eb07d829f
3 changed files with 26 additions and 4 deletions
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8
Documentation/git-worktree.txt
View file

@ -9,7 +9,7 @@ git-worktree - Manage multiple worktrees
SYNOPSIS
--------
[verse]
'git worktree add' [-f] [--detach] [-b <new-branch>] <path> <branch>
'git worktree add' [-f] [--detach] [-b <new-branch>] <path> [<branch>]
'git worktree prune' [-n] [-v] [--expire <expire>]
DESCRIPTION
@ -45,11 +45,15 @@ pruning should be suppressed. See section "DETAILS" for more information.
COMMANDS
--------
add <path> <branch>::
add <path> [<branch>]::
Create `<path>` and checkout `<branch>` into it. The new working directory
is linked to the current repository, sharing everything except working
directory specific files such as HEAD, index, etc.
+
If `<branch>` is omitted and neither `-b` nor `-B` is used, then, as a
convenience, a new branch based at HEAD is created automatically, as if
`-b $(basename <path>)` was specified.
prune::

8
builtin/worktree.c
View file

@ -291,12 +291,16 @@ static int add(int ac, const char **av, const char *prefix)
die(_("-b and -B are mutually exclusive"));
if (ac < 1 || ac > 2)
usage_with_options(worktree_usage, options);
if (ac < 2 && !new_branch && !new_branch_force)
usage_with_options(worktree_usage, options);
path = prefix ? prefix_filename(prefix, strlen(prefix), av[0]) : av[0];
branch = ac < 2 ? "HEAD" : av[1];
if (ac < 2 && !new_branch && !new_branch_force) {
int n;
const char *s = worktree_basename(path, &n);
new_branch = xstrndup(s, n);
}
argv_array_push(&cmd, "checkout");
if (force)
argv_array_push(&cmd, "--ignore-other-worktrees");

14
t/t2025-worktree-add.sh
View file

@ -145,4 +145,18 @@ test_expect_success '"add -b" with <branch> omitted' '
test_cmp_rev HEAD burble
'
test_expect_success '"add" with <branch> omitted' '
git worktree add wiffle/bat &&
test_cmp_rev HEAD bat
'
test_expect_success '"add" auto-vivify does not clobber existing branch' '
test_commit c1 &&
test_commit c2 &&
git branch precious HEAD~1 &&
test_must_fail git worktree add precious &&
test_cmp_rev HEAD~1 precious &&
test_path_is_missing precious
'
test_done